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2/5x = x-30
2/5x - x = -30
-3/5x = -30
x=-30 * (-5/3)
x=50 <---- odp.
spr.
2/5 * 50 zł= 20zł
50zl - 20 zł = 30 zł
150:2=75zł to jest początkowa cena bluzki